Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec543ed98163049…

MALICIOUS

PDF

79.4 KB
MD5: 032d3f5139137362d4765089d66457da SHA-1: e32a6be1a6dbf3ab8f1ebff34f1f3e435d3be2bd SHA-256: 1ec543ed98163049301b79d8b5b21c4774fdb27949c4bfa3b352953320e9f486
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file utilizes XFA (XML Forms Architecture) which is a known vector for embedding malicious content. Heuristics indicate an embedded script payload and a critical ClamAV detection (Pdf.Exploit.Agent-6136306-0) confirms its malicious nature. An extracted artifact was also flagged by ClamAV (Js.Exploit.HTML-29), suggesting the embedded script is likely an exploit. The ML classifier strongly supports the malicious verdict. The embedded URLs are not directly indicative of malicious activity but are part of the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000023c.bin
1fcae194de1796aa7aef7972273d156f7eefedb2b14d0d51f0c00daa0325ec76		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80633 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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